AMD has taken the wraps of the Radeon HD 7970 graphics card. Billed as the world's fastest single GPU graphics card and the only GPU based on 28nm production technology, the new arrival pushes AMD ahead of NVIDIA in terms of miniaturization. The HD 7970 uses a new Graphics Core Next (GCN) architecture that AMD says results in a 150 percent performance/sq mm jump over the previous 40nm-based generation, is compatible with PCI Express 3.0 and features 3GB of GDDR5 memory and 925MHz engine clock. It also supports Direct3D 11.1 to be released with Windows 8.